#include <bits/stdc++.h>
using namespace std;
int main(){
    int t,x,y;
    string s;
    int c[255];
    // freopen("input.in","r",stdin);
    // freopen("output.out","w",stdout);
    cin>>t;
    while(t--){
        memset(c,0,sizeof(c));
        cin>>s;
        x=y=0;
        for(int i=0;i<s.size();i++){
            if(c[s[i]]==0){
                x++;
                c[s[i]]++;
            }else if(c[s[i]]==1){
                y++;
                c[s[i]]++;
            }
        }
        cout<<(x+y)/2<<endl;
    }
}